Please note that the dimensions shown are respective radius values, not diameter

Question

Please note that the dimensions shown are respective radius values, not diameters as shown in the drawing.

A long non conducting cylinder has a charge density ? = ? r, where ? = 5.85 C/m^4 and r is in meters. Concentric around it is a hollow metallic cylindrical shell.

Part C:

What is the direction of the electric ?eld at 12 cm from the central axis?

Options(Please choose one):

1. Points radially inward.

2. Undetermined, since the ?eld is zero.

3. Points radially outward.

4. The electric ?eld is not a vector and therefore has no direction.

Part D:

What is the electric ?eld at 20.3 cm from the central axis? Answer in units of N/C

Part E:

What is the surface charge density inside the hollow cylinder? Answer in units of C/m^2

I already completed Part A and B by using this formula,R^3a/3rEo where R is 4.26cm. I would like some one to explain how to work these problems because I really would like to now how to work these problems myself.

Explanation / Answer

http://www.chegg.com/homework-help/questions-and-answers/long-non-conducting-cylinder-dark-gray-charge-density-961-945-r-945-653-c-m-4-r-meters-con-q1144958

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